HELP WITH SOURCE BY MOVEMENT

Chuck Hartle has some convincing arguements regarding source by movement, especially with a GM inventory with access to high year information. One area that I need help understanding is; when you set up a separate source for the new year-model parts that you are somewhat speculating on, when do these move to the normal stocking ABC sources? Should this be determined by age or movement? Let's say that you bring in a new part and 6 months later you are selling 5 a month. Would you move it to the regular ABC source group or leave it where it is? The way I see it there would be no reason left for separating it. Now it would do better in the regular source for 60 hits a year. Is my logic correct and if so what is the best way/time to move them? Would I just run a movement report and move these to the new source?
Thanks in Advance
THOOK
Thanks in Advance
THOOK